Pump jack



June 6, 1.939. F, D GUNSAULLUS 2,161,252

By /wwl June 6, 1939.

F. DA GUNsAuLLus PUMP JACK Filed Nov. 2o, 19s? 2 sheets-sheet 2 Invenor wh ,am

yPatented June 6, 1939 PATENT OFFICE PUMP JACK Fred D. Gunsaullus, Pampa, Tex., assigner of one-halfy to Letitia Gantz, Pampa, Tex.

Application November 20, 1937, Serial No. 175,724

2 claims.y

This invention relates .generallyto pumps and more particularly to pump jacks.

An object of the present invention isto provide for the operating in an improved manner a vertically moving pump rod, or as otherwise known, a polish rod, and to that end lembodies a novel and practical arrangement of pulley wheels over which the operating cable for the polish rod is trained, and an equalizing device for distributing equal stress to the cable so that the cross head connected to the vcable will be supportedy in a true horizontal transverse position preventing side whip or lash of the polish rod when the pump is in operation.

l5 The invention together with its objects and advantages will be best understood froma study of the following description taken in connection with the accompanying drawings wherein:

Figure l is a side elevational view illustrating the application of the invention,

Figures 2 and 4 are detail sectional views taken substantially on the lines 2-2 and 4 4 respectively of Figure 1, v Figure is a vfragmentary detail View partly in section and partly in elevation suggesting'two positions which the ruppermost, pulley wheels may assume, x

Figure 5 is a fragmentary top plan View showing the equalizing device, and f 3Q Figure 6 is a perspective view of the cross head.LA

Referring to the drawings by reference numerals it will be seen that in accordance with the present invention there are provided a pairof sills 1,' 8 on which is mounted a frame comprising a pair of beams I2 which at one end are connected by a transverse beam I3 thatis disposed in spaced parallelism to a transverse beam Suitably supported on the sill 8 and rising therefrom between the beams I3 and I4 are short posts I5 to which are pivoted as at I5 standards I6.

As shown in Figure 2 the standardsl converge toward one another at their upper ends and intermediate their` ends are braced by a cross member I1.

At the upper ends'thereof the standards I6 merge into a bearing I8 in which is tted a shaft I9 on the opposite ends of which are grooved pulley wheels or sheaves 20.

For supporting the standards I6 in a vertical position as shown in Figure 3 there are provided props 2| which at their upper ends are pivoted as at 22 to the bearing-equipped ends of the posts or standards I6. At the lower ends thereof (Cl. 'I4-103) the props 2l are adapted to be detachably connected as at 23 to ears 24 that extend upwardly from the 4upper ends of standards 25 rising from the beams I2.

Props 2i are somewhat in the nature of turn- 5 Abuckles as shown in Figure 3 so that said props may be longitudinally adjusted for positioning the standards I8 in a position of adjustment as will insure the maintaining of the polish rods perpendicular at all times. 10

The standards 25 which are relatively short are braced through the medium of diagonal braces 26 and at their upper ends are suitably provided to accommodate therebetween a shaft 2l on which are mounted a pair of grooved pulley 15 wheels or sheaves 28.

Trained over the sheaves or pulley wheels 28 and 20 are opposite end portions of a cable 29 the terminals of which are adapted to be connected in any suitable manner with headed studs 20 30 provided on the relatively opposite ends of a. cross head 3l.

The cross'head 3| is provided with an opening 32 to accommodate the polish rod 33.

As shown in Figure 2 the polish rod 33 has 25 clamped thereon above the cross head 3l a collar 34 composed of a pair of complemental sections whichrat their lower ends are provided with extensions35 that are accommodated in a recess 36 provided therefor in the upper end of the 30 opening 32. Also clamped on the polish rod 33 below the cross head 3| is a suitable clamp 3l. Thus it will be seen that the cross head is accommodated between the collars 34 and 31 so that vertical movement of the rod 33 relative to the 35 cross head 3I is positively prevented.

The shackle rod of the drilling apparatus is indicated by the reference numeral 38 and at one end thereof the shackle rod 38 is connected with the cable 29 through the medium of an equalizer 40 indicated generally by the reference numeral 39. The equalizer 39 comprises a pair of substantially triangular plates 40-40 that are secured together in spaced relation through the medium of a bolt 4I and a spacing sleeve 42. 45

Rotatably supported between the plates 4U at the widest ends of the plates are pulleys or sheaves 43 over which is trained an intermediate portion of the 'aforementioned cable 29.

At one end thereof the shackle rod 38 is pro- 50 vided with an eye that is accommodated between the smallest ends of the plates 40 and through the medium of said eye and bolt and nut means 44 said end of the shackle rod is connected with the plates 40 of the equalizer device. 55

For use as a safety stop for the shackle rod there is disposed on said rod 38 a clamp 45, the clamp 45 being disposed on the rod nearest to the eye-equipped end thereof, and the stop 45 may be secured on the rod 38 at the desired position of adjustment, and acts as a safety stop in case of breakage of power appliances and also to prevent a longer stroke than provided for at the cross head 3|.

The shackle rod 38 also works through a guide 46 mounted on and supported between the beams I2, and suitably journaled within the guide 46 is a pulley or sheave 4l in the groove of which the shackle rod 38 is accommodated as clearly shown in Figure 4.

As is well-known the shackle rod 38 is con'- nected with the usual power unit for the pump jack through the medium of arod or cable and. to which rod or cable one end of the shackle rod 38 is connected through the medium of a turnbuckle the adjusting screw of which is shown in the drawings andl indicated by the reference numeral 4l, and which turn-buckle has the screw thereof provided with an eye through the medium of which and a bolt 48 said turn-buckle screw is connected with a swivel 49 on the end of the shackle rod 38 as shown.

Also the shackle rod 38 at the swivel equipped end 49 thereof is equipped with a stop member 56, in the form of a two-part clamp and which is adapted to engage and abut the guide 46 in the event there be any breakage in the connection between the shackle rod 38 and the power unit.

It is obvious that in actual practice drive from the power unit is transmitted to the shackle rod 38 causing the latter to reciprocate, and this reciprocatory movement of the rod 38 is transmitted to the equalizer 39, and from the equalizer 39 through the cable 29 to the cross head 3l for alternately lowering and raising, or in other words reciprocating the polish rod 33.

The equalizer 39 will serve to equalize uneven stress caused by Wear on the cable 29 and. Will assure even and equal lift, stress or pull on the ends of the cable secured to the cross head and will further assure perfect vertical pump rod lift since the cross head will always remain in a substantially perfect level horizontal position thereby preventing transverse motion or side lash being imparted to the polish rod.

It will also be seen, from a study of Figure 3, that when it is desired to repair the pump or well or to remove rods or tubing, the end of the props 2l may be disconnected from. the extenlby the frame, a cross head connected with the pump rod, a iiexible member having its ends connected with the ends of the cross head, the two parts ofthe flexible member passing upwardly over the upper pair of pulleys and then downwardly under the lower pair of pulleys, a supporting member, a pulley carried thereby and around which the flexible member passes, a reciprocating rod supported for horizontal movement on the frame and having one end connected with the supporting member, means for reciprocating the rod, a guide on the frame through which the rod passes, a grooved sheave. in the guide, through the groove of which the rodv passes, and adjustable stops on the rod, one on one side of the guide and the other on the opposite side of the guide.

2. A pump jack of the class described comprising a frame horizontally arranged, an upright frame having its lower end pivotally supported from the horizontal frame,` a -pair of pulleys carried by the upper end of the upright frame, a pair of short uprights carried by the horizontal frame in rear of the rst upright frame, a pair of pulleys carried by the short uprights, a cross head connected with the pump rod, a flexible member having its ends connected with the ends of the cross head, and the two parts of the flexible member passing upwardly over the pulleys of the rst-mentioned upright frame and under the pulleys of the short uprights, an equalizer device including a pulley around which the bight of the flexible ymember passes, a reciprocatory rod connected with the equalizing de- Vice, means for reciprocating said rod, a brace, means for adjusting the length of the brace, means for pivotally connecting the upper end of the brace to the upper end of the upright frame, and means for detachably connecting the lower end of the brace to the short upright members.

F. D. GUNSAULLUS. 

